Skiving machine



June 16, 1936. H. LYON sKIvING MACHINE 2 Sheets-Sheet 1 Filed Dec. 10, 1934 I m: """mmm June 16, 1936- H. LYON SKIVING MACHINE 2 Sheets-Sheet 2 Filed Dec. 10 1934 Patented June 16, 1936 UNITED STATES PATENT OFFICE SKIVING MACHINE Application December 10, 1934, Serial No. 756,805

7 Claims.

This invention relates to splitting or skiving machines and is herein illustrated as embodied in a machine which is particularly adapted to remove a thin chip or skiving from a piece of sheet material.

In the manufacture of top facings for boots and shoes, it is sometimes desirable to piece together by overlapped cemented joints strips of leather or fabric which have on one of their faces a coat of finishing material such, for example, as pyroxylin. In order to expose along a margin of the coated side a surface to which the cement will firmly adhere, as well as to produce a neat joint, it is necessary to remove the coating along said margin. It is also desirable in some cases in the manufacture of parts of boots and shoes to remove a thin split or skiving from the grain side of a piece of leather.

In order to accomplish the removal of a thin chip or shaving from these and similar pieces of work, there is provided, in accordance with the present invention, an unyielding feed member, a knife and a work support having a work-gaging corner, said knife and support being held in a predetermined fixed relation to each other but may yield in unison toward and from the feed member. In the illustrated machine, which is particularly adapted to remove a thin chip or skiving of coating material from a selected margin of a piece of work, the feed member is a roll which is rotated about a fixed axis; and the knife and the work support, which are initially adjusted into relative positions with respect to each other to produce a chip of the desired thickness, are mounted for yielding swinging movement in unison toward and from the feed member. With this construction, a thin chip or shaving of uniform thickness may be removed from a piece of work irrespective of variations in the thickness of the work.

These and other features of the invention, including certain details of construction and combinations of parts, will be described as embodied in an illustrated machine and pointed out in the appended claims.

Referring now to the accompanying drawings,

Fig. 1 is a front elevation of a machine in which the present invention is embodied;

Fig. 2 is an end elevation of the machine;

Fig. 3 is a cross-section of the machine on the line III-III of Fig. 1;

Fig. 4 is a perspective on an enlarged scale of the work-engaging parts, a piece of work being shown in broken lines in process of being operated upon;

Fig. 5 is a perspective of a piece of work after it has been operated upon; and

Fig. 6 is a detail, principally in elevation, Sh0W- ing the positions of the knife and the work support with respect to each other, a portion of the Work bender having been broken away.

The machine, as has been stated, is designed to remove from a piece of flexible material a thin chip or shaving of a uniform and predetermined thickness. For example, in piecing together strips of a sheet of material (Fig. 5) of a total thickness of approximately .011 of an inch, consisting of a. base I00 of fabric having a smooth layer of finishing material 200 of a thickness of approximately .003 of an inch, the procedure is to skive the margin of one piece on the fabric side, to remove the coat of finishing material from along the margin of the other piece and then to cement the skived margin of the one piece to the margin of the other piece from which the coating has been removed. The illustrated machine serves in this particular case to remove the layer of coating material from a selected margin of one of the pieces to produce the result shown in Fig. 5. In order to remove from the margin of the piece a strip of coating material which is, of course, of uniform thickness, irrespective of variations in the thickness of the work, the work is fed by an unyielding feed member over a work support to a knife, said knife and Work support being held in fixed relation but being mounted for yielding movement together away from the feed member.

In the illustrated machine, the feed member is a roll I having on its periphery very fine teeth, said roll, for the purpose of securing extreme accuracy, being integral with its shaft 9 which is mounted in bearings formed in two upright standards'lii bolted to the base I5 of the machine. Also mounted in bearings in the standards I3 is a drive shaft ll carrying the usual fast-and-loose pulleys l9, 2!, said drive shaft having a gear 23 which meshes with a gear 25 on the shaft 9. Mounted in bearings in the standards l3, below the drive shaft 17 is a rockshaft 21 about the axis of which the knife and the work support, both later to be described, may swing together toward and from the feed roll. The knife 29 (Fig. i), which has beveled sides, is adjustably held by a clamp 3| in an undercut guideway formed in a knife block 33. This knife block, only a small portion of which appears in the figures, has in its rearpart an open-sided bore to receive the end of the rockshaft 21, said bore extending more than around the shaft, this construction facilitating the removal and replacement of the knife. The clamp 3| engages one side of the knife and is held in place by a screw-bolt which passes through a bore in the clamp and is threaded into the knife block. The knife block in turn is adjustably held in angular position on the shaft 21 by a. segmental clamp 3! (Fig. 2) and a screw-bolt 39 which passes through a bore in the clamp, through a slot in the knife block, and is threaded into the shaft 21. By reason of the slot in the knife block, a certain amount of angular adjustment of the block is made possible. Fastened to the knife block 33 by screws 4| is a lever 43 the lower end of which normally contacts with the end of a stop-screw 45 threaded through a split bearing in a block 47 which is fastened to a leg of the base of the machine by screws 49. A pinch-screw 50 holds the stop-screw 45 in adjusted position. A rod 5| on which the work support (later to be described) is mounted is suspended from the rockshaft 21 by two links 53, 55. The link 53 (Fig. 3) has at its upper end a hub which receives the shaft 21 and is fastened to said shaft by a taperpin 51, said link having at its lower end a second hub which receives the rod 5| and is adjustably fastened to said rod by a set-screw 59. The link 55 (Fig. 1) has at its upper end a hub which receives the rockshaft 21 and is fastened to said shaft by a taper-pin 6|, said link having at its lower end another hub which receives the rod 5|. The rod 5| is in this manner carried by the rockshaft 21. A collar 63 fastened to the rod 5| by a setscrew 64 has a depending tail 65; and a set-screw 65 is threaded through this tail in position to contact with the base I5. The work support I5 is' fastened to the outer end of the rod 5| in a manner presently to be described and is urged to swing upwardly about the axis of the shaft 21 by a compression spring 69 which encircles the head of a screw-bolt II, rests upon the base I5 and bears with its upper end against the under side of the hub at the lower end of the link 53. The action of the spring 69 may be supplemented by a tension spring I69 which conmeets the lever 43 to one of the legs of the machine. The limit of upward swinging movement of the work support and the knife about the axis of the rockshaft 21 is limited by the engagement of the lever 43 with a stop-screw I 55 which is threaded into one of the standards I3. As long as the set-screw 59 is tight, the rod 5|, and con 'sequently the work support I5, is rigidly held and can not turn about the axis of the rod 5|. When, however, the set-screw 59 has been loosened, the work support may be turned to adjust the operative portion of the work support toward and from the edge of the knife.

The work support I5, which is in the form of a mutilated disk, is mounted (Fig. 1) on the outer portion of reduced diameter of the rod 5|, being located between two spacers II, I9 and clamped to the spacers and to the rod by a nut 8| threaded on the outer end of the rod. Referring to Fig. 6, the relative positions of the knife 29, the feed roll I and the work support I5 are clearly shown. As clearly shown in this figure, the shape of the disk I5 is such as to provide a flat substantially vertical surface I I5 the intersection of which with the periphery of the disk results in a sharp corner 215. When the parts are in properly adjusted position, this surface II5 lies substantially in a plane passed through the axis of the shaft of the feed roll I and through the axis of the rod 5|; the upper corner 275 is located below the edge of the knife a distance equal to the thickness of the chip or skiving which is to be removed from the work, and the surface I15 is spaced substantially the same distance from the edge of the knife. As has been explained above, the knife and the work support, once they have been adjusted, are held in fixed relation with respect to each other but may yield together away from the feed roll so that a chip or skiving of uniform thickness will be removed from each piece of work irrespective of variations in the thickness of such pieces.

In order to facilitate presentation of pieces of work to the machine, a saddle 61 (Fig. 4) which is fastened to the work support i5 is provided with a flat work-supporting upper surface IS! the forward edge 26! of which terminates short of the operative edge of the work support I5. The saddle has a groove in its inner surface to receive the work support I5 and is held in adjusted angular position on the work support by small set-screws 85 which are threaded through one wall of the groove and abut one side of the work support. An edge guide 81 which extends somewhat under the feed roll is adjustably fastened to an inclined fiat surface of the saddle 5] by a screw 89 which passes through a slot in the edge guide and is threaded into the saddle. The knife 29 is adjusted about the axis of the rockshaft 21 to raise and lower the edge of the knife by turning the set-screw 45 after the clamping screw 39 has been loosened. The knife is adjusted horizon- 35 has been tally after the clamping screw loosened. The saddle 6? may be adjusted on the periphery of the work support I5 after the setscrews 85 have been loosened. The work support is adjusted about the axis of the rod 5| by turning the stop-screw 66 after the set-screw 59 has been loosened. By these adjustments, the elevation of the edge of the knife above the corner 275 (Fig. 6) of the work support and the distance of the edge of the knife from the plane of the vertical surface I15 of the work support may be very accurately determined. After a period of wear, it may be necessary or desirable to remove the work support and regrind the flat surface II5 (Fig. 6).

In operating upon a. piece of work of the kind shown in Fig. 5, it is desirable to produce as nearly as possible an abrupt shoulder along the edge 39!! of the finishing coat 209. To this end, there is pivoted to the saddle 51, at 9|, a work bender 93 which may be adjusted about the pivot and held in angular adjusted position by a set-screw 95 which is threaded through the work bender and abuts a face of the saddle 61. When a chip or skiving is to be removed from apiece of work, such as that shown in Fig. 5, this work bender 93 is adjusted (as shown in Fig. 4) into a position in which the forward (left-hand) portion of its flat upper surface is slightly above the flat surface IGI of the saddle. The effective surface of this work bender extends close to the feed roll I and imparts to the work along the line 398 (Fig. 5) a slight upward bend which ensures the formation of an abrupt shoulder along that line. the feed roll I has no yielding movement and that the knife and the work support are held in fixed positions relatively to each other but may yield together to take care of inequalities It will be noted that in the thickness of the work. The corner 215 of the work support, so far as the knife is concerned, is a fixed gage, and the relative positions into which the knife and the Work support are initially adjusted determine the thickness of the chip which is removed.

In the operation of the machine, after the knife 29, the work support 75, the saddle 6'! and the edge guide 81 have been properly adjusted in the manner described above, the work is fed through the machine with the side from which the chip is to be removed resting upon the upper portion of the work support 75 and upon the saddle 61 and the bender 93, the chip passing beneath the knife and the body portion of the work over the knife. When the work is passing through the machine (Fig. 2), owing to the fact that the work support 15 and its rod have been swung slightly about the axis of the rockshaft 21, the screw 66 is out of contact with the base [5, and the screw 45 is out of contact with the lever 43. When very thin work, such as that which has been described is being operated upon, the spaces between these two screws and their respective abutments is of course very slight.

Although the invention has been set forth as embodied in a particular machine adapted to operate upon a particular kind of work, it should be understood that the invention is not limited in the scope of its application to the particular machine nor to operation upon the particular work which have been shown and described.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. A machine of the class described having, in

combination, a roll, means for rotating the roll about a fixed axis to feed the work, a knife and a work support pivoted about a common axis, means for permitting adjustment of the knife with respect to the work support, about said axis and for holding it in adjusted position, and yielding means for urging the knife and work support to swing about said axis toward the feed roll.

2. A machine of the class described having, in combination, a roll, means for rotating the roll about a fixed axis, a knife, a work support, a rockshaft by which the knife is carried, a rod also carried by the rookshaft, a work support carried by the rod, means permitting adjustment of the knife about the axis of the rockshaft, means permitting adjustment of the work support about the axis of the rod, and yielding means for supporting the knife and the work support.

3. A machine of the class described having, in combination, a feed roll, a work support in the form of a mutilated disk to provide on a part of the disk a fiat face the plane of which contains both the axis of the feed roll and that of the disk, a knife held in fixed relation to the corner formed at the junction of the flat face and the periphery of the disk, means for adjusting the relative positions of the knife and the work support and for holding these two members in adjusted positions, and means for supporting the knife and work support for yielding movement together.

4. A machine for removing a thin chip from the margin of a piece of sheet material having, in combination, a feed roll, a knife, a work support having a sharp corner held in fixed relation to the edge of the knife, and a member for bending the work to cause an abrupt shoulder to mark the line of separation between the body of the work and the margin of the work from which the chip is removed.

5. A machine for removing a thin chip from the margin of a piece of sheet material having, in combination, a feed roll, a knife, a work support having a sharp corner held in fixed relation to the edge of the knife, means for supporting the knife and the work support for yielding movement in unison, and a member for bending the work to cause an abrupt shoulder to mark the line of separation between the body of the work and. the margin of the work from which the chip is removed.

6. A machine of the class described having, in combination, a roll for feeding the work, a knife, a work support having a rigid work-gaging corner, means for maintaining said corner in predetermined fixed position with respect to the knife, means for holding the work support from rotary movement, and means for supporting the knife and work support for yielding movement with respect to the feed roll.

7. A machine of the class described having, in combination, a feed roll, means for rotating the roll about a fixed axis to feed the work, a rod, a work support and a knife mounted independently of each other about the axis of the rod, and means including a spring for supporting said rod for movement toward and from the feed roll.

HARRY LYON.

CERTIFICATE OF CORRECTION.

Patent No 2,044, 089. June 16, 1956.

HARRY LYON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, second column, line 48,, claim 7, after "other" insert the words on said rod and adjustable independently of each other; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office Signed and sealed this 22nd day of September, A. D. 1956.

Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

